N-Methylpyrrolidone solvent in esterification of carboxybenzenes

Details N-Methylpyrrolidone solvent in esterification of carboxybenzenes N-Methylpyrrolidone solvent in esterification of carboxybenzenes

1979-06-04

1982-03-23

Garner, Vivian

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

252 86, 252 89, 560 83, 560 84, C07C 6708, C07C 6726

Patent

active

043214037

ABSTRACT:
An anhydride of a carboxybenzene is esterified in solution by a fluorinated alcohol, using N-methylpyrrolidone solvent. In particular, pyromellitic dianhydride in N-methylpyrrolidone solvent is esterified to the diester/diacid by 2-(n-perfluoroalkyl)ethanols having six to twelve carbon atoms in the perfluoroalkyl groups, and the reaction mixture containing the dissolved diester/diacid is admixed with an oxirane compound of the group ethylene oxide, epichlorohydrin and glycidol whereby the carboxyl groups are esterified in the N-methylpyrrolidone solvent by reaction with oxirane groups.

REFERENCES:
patent: 3391179 (1968-07-01), Hallander et al.
patent: 3547861 (1970-12-01), Anello et al.
patent: 4125733 (1978-11-01), Sandler
patent: 4134839 (1979-01-01), Marshall

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